Belkovite Mineral Data

Belkovite Mineral Data +

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General Belkovite Information

Chemical Formula:

Ba3(Nb,Ti)6(Si2O7)2O12

Composition:

Molecular Weight = 1,407.69 gm

Barium 29.27 % Ba 32.68 % BaO

Titanium 6.80 % Ti 11.35 % TiO₂

Niobium 26.40 % Nb 37.77 % Nb₂O₅

Silicon 7.98 % Si 17.07 % SiO₂

Oxygen 29.55 % O

______ ______

100.00 % 98.86 % = TOTAL OXIDE

Empirical Formula:

Ba₃Nb₄Ti₂2(Si₂O₇)O₁₂

Environment:

Of secondary origin, formed by the alteration of barium-rich pyrochlore during dolomitization of calcite carbonatites in pyroxenites.

IMA Status:

Approved IMA 1989 (Dana # Added)

Locality:

In the Vuoriyarvi carbonatite complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For I.V. Bel'kov (1917-1989), Soviet mineralogist who explored the Kola Peninsula, Russia.

Synonym:

ICSD 39223

IMA1989-053

PDF 45-1404

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Belkovite Crystallography

Axial Ratios:

a:c = 1:0.86694

Cell Dimensions:

a = 8.996, c = 7.799, Z = 1; V = 546.60 Den(Calc)= 4.28

Crystal System:

Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 62m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.937(1), 3.888(0.51), 7.81(0.35),

Physical Properties of Belkovite

Cleavage:

None

Color:

Brown.

Density:

4.16

Diaphaniety:

Transparent

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Adamantine

Streak:

white

Optical Properties of Belkovite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2255,KPDmeas= 0.232,KC= 0.2231

Optical Data:

Uniaxial (+), w=1.928, e=2.002, bire=0.0740.

Calculated Properties of Belkovite

Electron Density:

r_electron=3.89 gm/cc
note: r_Belkovite=4.28 gm/cc.

Fermion Index

Fermion Index = 0.06482
Boson Index = 0.93518

Photoelectric:

PE_Belkovite= 171.58 barns/electron
U=PE_Belkovite x r_electron= 667.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Belkovite is Not Radioactive

Belkovite Classification

Dana Class:

55.4.3.1 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.4)with cations in [8] and lower coordination

(55.4.3)Dana Group

55.4.3.1 Belkovite ! Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2

Strunz Class:

VIII/C.14-30 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.14 - Fresnoite - Belkovite series

VIII/C.14-20 Muirite Ba10Ca2MnTiSi10O30(OH,Cl,F)10 P 4/mmm 4/m 2/m 2/m

VIII/C.14-30 Belkovite Ba3(Nb,Ti)6(Si2O7)2O12 P 62m 6 m2

VIII/C.14-40 Murmanite Na3(Ti,Nb)4(Si2O7)2O4·4(H2O) P1 ? 1

VIII/C.14-50 Epistolite Na4Nb2Ti(Si2O7)2O2(OH)2·4(H2O) P1 1

VIII/C.14-70 Lomonosovite Na5Ti2O2(Si2O7)(PO4) P1 1

VIII/C.14-80 Vuonnemite Na11Nb2TiSi4O12(PO4)2O5F2 P1 1

VIII/C.14-110 Bussenite! Na2(Ba,Sr)2(Fe,Mn)TiSi2O7(CO3)(OH)3F P1 1

VIII/C.14-120* Quadruphite-VII Na14CaMgTi4[Si2O7]2(PO4)4O4F2 P1 1

VIII/C.14-120 Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2 P1 1

VIII/C.14-130 Sobolevite Na11(Na,Ca)4(Mg,Mn)Ti4(Si4O12)(PO4)4O5F3 P1 1

VIII/C.14-140* Polyphite-VII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

VIII/C.14-140 Polyphite-VIII Na17Ca3Mg(Ti,Mn)4[Si2O7]2(PO4)6O2F6 P1 1

Other Belkovite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

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Print or Cut-and-Paste your Belkovite Specimen Label here :

Belkovite

Ba3(Nb,Ti)6(Si2O7)2O12
Dana No: 55.4.3.1 Strunz No: VIII/C.14-30
Locality:

Notes: